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Summary: added merge support for WBWIMemTable. Most of the preparation work is done in https://github.com/facebook/rocksdb/issues/13387 and https://github.com/facebook/rocksdb/issues/13400. The main code change to support merge is in wbwi_memtable.cc to support reading the Merge value type. The rest of the changes are mostly comment change and tests. Pull Request resolved: https://github.com/facebook/rocksdb/pull/13410 Test Plan: - new unit test - ran `python3 ./tools/db_crashtest.py --txn blackbox --txn_write_policy=0 --commit_bypass_memtable_one_in=100 --test_batches_snapshots=0 --use_merge=1` for several runs. Reviewed By: jowlyzhang Differential Revision: D69885868 Pulled By: cbi42 fbshipit-source-id: b127d95a3027dc35910f6e5d65f3409ba27e2b6b